A025286 Numbers that are the sum of 2 nonzero squares in exactly 3 ways.

325, 425, 650, 725, 845, 850, 925, 1025, 1250, 1300, 1325, 1445, 1450, 1525, 1690, 1700, 1825, 1850, 2050, 2225, 2425, 2525, 2600, 2650, 2725, 2825, 2873, 2890, 2900, 2925, 3050, 3125, 3380, 3400, 3425, 3650, 3700, 3725, 3757, 3825, 3925, 4100, 4205

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Comments

A025426(a(n)) = 3. - Reinhard Zumkeller, Feb 26 2015

Links

• Donovan Johnson, Table of n, a(n) for n = 1..1000
• G. Xiao, Two squares
• Index entries for sequences related to sums of squares

Crossrefs

Cf. A025426.

Programs

Haskell

a025286 n = a025286_list !! (n-1)
a025286_list = filter ((== 3) . a025426) [1..]
-- Reinhard Zumkeller, Feb 26 2015